Reservoir Monitoring And Evaluating On PTT Barat-Laut Structure As Part Of Reservoir Management Process.
Abstract
The two important things in Reservoir Management Process are monitoring and evaluating. This paper will describe application of both steps on PTTBarat-laut structure.
PTT Barat-laut is one of hydrocarbon producing structures in Pangkalansusu field. Study on this structure is performed through several technical approaches, which are continuous monitoring on production well performance, well testing analysis, and 3-D seismic interpretation, for reservoir modelling.
An unique phenomenon is shown by the result of Pressure Build Up test which has been taken from several wells, providing layer or fracture indication in reservoir of PTT Barat-laut structure.
The other monitoring that occurs from production performance shows an anomaly on its decline rate, reaching 85–95%/well/year 3-D Seismic analysis on this structure shows several anomalies on its lines. "High amplitude"characteristic anomalies on 860 and 910 zones (the productive zones) refer some faults presence, and very strong "bright spot" performances have provided an indication of hydrocarbon accumulation in this structure.
By utilizing the techniques above can be obtained a global illustration of reservoir and geological characteristics of the structure. Further more, they will provide more realistic development idea.
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The modem reservoir management process involves establishing a purpose or strategy and developing a plan, implementing and monitoring the plan, and evaluating the results. This paper present application of them on Pantai Pakam Timur gas field.
Pantai Pakam Timur is a new gas field in Pertamina Operasi Rantau Aset Pangkalansusu. This field located in the onshore portion of the North Sumatra Basin Indonesia. The Area is approximately 15 km North-West of Medan. The Pantai Pakam Timur Structure was discovered as gas and condensate entrapment in the major of Belumai formation (Z-238S,2400), Apart from that, there is Shallow prospect of Keutapang formation (Z-127S) is known brightly as "Strong reflection" in Seismic which about 1300 milli Sec.
Since the test production has just started about 9 years ago, it is very important evaluate the reservoir characteristics to obtain reliable data to set up the future field development strategy. The Pressure Transient testing of several wells show existing very difference of rock characteristic (the main is permeability) between deep zone (Z-238S,2400) and shallow zone (Z-127S), which on deep zone less than 5 Md, then on shallow zone (under discussion) the fantastic permeability had been found, they were greater than 500 MD from PPT-05A and PPT-06 wells.
The monitoring and evaluating are being performed through several technical approaches respectively, which are continuous monitoring on production performance, evaluating on well testing analysis and evaluating the P/Z versus Cumulative gas production plot, that is used by comparing toward Volumetric method, in line to Reserve estimation.
Furthermore the gas deliverability was conducted based on modified isochronal test results of several existing wells and appropriate Reserve to get more realistic and maximize the potential. (The strategy and developing stage).
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The mooern reservoir ~a n a~e m e~~ process involvas OSS krr strategy and developinp a plan, ~m~~e~e~~i~~ an ~o~i t~~n~ the plm, and evaluating the results. This poster presents application of this process on the Pantai Pakam Timur gas field
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